Beep Codes Before and During the Video Test
The purpose of POST to first test and check the most basic components of the system, then it transfers control to the boot drive, and the operating system is loaded. In a healthy system, the POST reports by using a series of beep codes and screen messages to convey that all components are working properly or not.
If the POST detects a problem, that enough to keep the system from operating properly, and halts the system boot process. It sometime called fatal errors because they prevent the system from booting. The following table lists the basic beep codes for AMI and phoenix BIOS. (The following table is an example only. Each ROM BIOS encompasses its own beep codes & their respective problems).
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